As helpful as Orange may be they're clearly going to stick with their existing design philosophy, however flawed it may be. You may have to contemplate 'going it alone' to achieve a satisfactory outcome despite the fact that the frame's still within warranty.

Do the bolts thread into the adjustable plate or are they a nut and bolt job? If the former you've got a finite life span either way. I'd go with the latter option, subject to the 'meat' of the surrounding area and drill out, fixing an M8 bolt with a 'nyloc' nut and maybe even some thread lock.

Don't be tempted to use stainless steel as despite looking lovely, it has, to the best of my knowledge, a lower tensile strength than mild steel.

I thought Orange may have solved this with their modified triangulated dropout but after reading the other thread, it seems not.

After spending a lot of time with motorcycles I have to say that most bicycle engineering is pants....

I had to replace mine with the new dropouts on their website. They've been fine since. It's a bit of a pain in the arse but I think in general the flexibility allowed by the design is worth it. The dropouts should be a lot cheaper though.